Perhaps you should try some spelling variations:
aller » allen, allem
vallex » valleix, valley, vallet
valles » valleys, valley, falles
vallee » valley
alterx » altere, altern, altera
allenrrn » allenare
alterna » alternate, alternans

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ( (alter OR aller) OR ( (((vallex OR valles) OR vallee) OR (alterx OR allenrrn)) OR alterna )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "( (alter or aller) or ( (((vallex OR valles) or vallee) or (alterx or allenrrn)) or alterna ))".
• Adding a wildcard symbol may retrieve word variants: ( (alter or aller) or ( (((vallex OR valles) or vallee) or (alterx or allenrrn)) or alterna ))*.